Which of the following help us believe that Earth's mass is distributed spherically and uniformly around Earth's center?
A. Earth's spherical shape and lack of rotational wobble
B. Lack of roughness of Earth's surface, Earth's spherical shape, and lack of rotational wobble
C. Lack of roughness of Earth's surface
D. Earth's spherical shape
E. Lack of rotational wobble
Answer: A
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A) less than 101,000,000 B) 101,000,000 C) more than 101,000,000
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Secondary messengers perform which of the following functions?
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"Biosolids" produced at a wastewater treatment plant are often ________
A) placed in deep injection wells to keep it out of the water table B) used as crop fertilizer C) used as part of the "fill" to develop wetlands into agriculture or housing areas D) trucked to special biohazard landfills for disposal E) loaded onto barges and sent to underdeveloped countries to use as fertilizer